Novel radiochromic gel dosimeter based on a polyvinyl alcohol – Iodide complex

Hayashi, Shin-ichiro; Ono, Kaoru; Fujino, Keisuke; Ikeda, Sachie; Tanaka, Kenichi

doi:10.1016/j.radmeas.2019.106226

Cited by 31 publications

(20 citation statements)

References 13 publications

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“…Figure 1(a) shows the PVA-GTA-I gel dosimeters irradiated with up to 10 Gy. As the absorbed dose increased, their appearance gradually changed from colorless to red, similar to that observed for the PVA-I gel dosimeters [1,2]. Fig.…”

Section: Absorption Spectrasupporting

confidence: 72%

“…Similar to a previous study [2], all samples were irradiated using a 6 MV X-ray from a medical linear accelerator (Varian/BrainLAB Novalis Tx, USA) at a depth of 5 cm in solid water phantom at room temperature (20-25 °C). Doses of up to 10 Gy were delivered to the samples, with an average dose rate fixed at 600 cGy/min.…”

Section: Irradiationmentioning

confidence: 99%

“…The absorption spectra of the samples were also measured as described in a previous study [2], one day after irradiation, using a UV-Vis spectrophotometer (UV-1600PC, Shimadzu, Japan). Absorbance (Abs) was calibrated using distilled water.…”

Section: Measurementmentioning

confidence: 99%

“…Recently, we developed a novel radiochromic PVA-I gel dosimeter [1,2]. The dosimeter utilizes the red color development due to the complexation of polyvinyl alcohol (PVA) with iodide (I3 ⁻ ) formed by irradiation in an aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

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Effects of PVA-GTA-I radiochromic gel dosimeter components on optical dose-response

Hayashi

Ono

Fujino

et al. 2022

J. Phys.: Conf. Ser.

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In recent years, a novel radiochromic gel dosimeter was developed that utilizes the color development of a polyvinyl alcohol-iodide (PVA-I) complex. In this study, we explore the effects of different iodide salts (LiI, NaI, KI, CsI, NH4I, CaI2, and ZnI2) and PVAs with different degrees of polymerization (500, 1000, and 1500) and saponification (80, 88, and 98 mol%) were investigated on a PVA-GTA-I gel dosimeter using PVA that was chemically crosslinked with glutaraldehyde (GTA) as a matrix. The results showed that these substitutions had negligible effect on dose-responses, such as sensitivity and dose-rate independence.

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Section: Absorption Spectrasupporting

confidence: 72%

Section: Irradiationmentioning

confidence: 99%

Section: Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of PVA-GTA-I radiochromic gel dosimeter components on optical dose-response

Hayashi

Ono

Fujino

et al. 2022

J. Phys.: Conf. Ser.

Self Cite

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“…3D dosimetry systems are proposed to address the abovementioned issues. These systems mainly include Fricke gels [6][7][8][9], polymer gels [10][11][12], radiochromic gels and plastics [13][14][15][16]. Fricke gels have been developed over the years and are good candidates for 3D dose mapping due to their excellent tissue equivalence, simple preparation and no oxygen effect.…”

Section: Introductionmentioning

confidence: 99%

Low-Diffusion Fricke Gel Dosimeters with Core-Shell Structure Based on Spatial Confinement

Zhang

Zeng

et al. 2021

Materials

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The diffusion of ferric ions is an important challenge to limit the application of Fricke gel dosimeters in accurate three-dimensional dose verification of modern radiotherapy. In this work, low-diffusion Fricke gel dosimeters, with a core-shell structure based on spatial confinement, were constructed by utilizing microdroplet ultrarapid freezing and coating technology. Polydimethylsiloxane (PDMS), with its excellent hydrophobicity, was coated on the surface of the pellets. The concentration gradient of the ferric ion was realized through shielding half of a Co-60 photon beam field size, and ion diffusion was measured by both ultraviolet-visible spectrophotometry and magnetic resonance imaging. No diffusion occurred between the core-shell pellets, even at 96 h after irradiation, and the diffusion length at the irradiation boundary was limited to the diameter (2–3 mm) of the pellets. Furthermore, Monte Carlo calculations were conducted to study dosimetric properties of the core-shell dosimeter, which indicated that a PDMS shell hardly affected the performance of the dosimeter.

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First Combined, Double‐Density LCV‐Pluronic F‐127 Radiochromic Dosimeter Mimicking Lungs and Muscles

Kozicki

Bartosiak

Maras

et al. 2023

Adv Materials Technologies

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3D chemical dosimetry of radiotherapy is an interdisciplinary research related to medical physics, polymer and radiation chemistry, photochemistry, organic chemistry, computer science, oncology, materials engineering, and automation technology. It consists of a 3D high resolution tissue equivalent dosimeter, high resolution 3D reading, and software packages for fast processing of 3D measurement data. Research on 3D radiotherapy chemical dosimetry has been going on for almost forty years, starting with the first proposal of a 3D dosimeter -Fricke dosimetric solution in a physical gel matrix with magnetic resonance imaging (MRI) reading to record the spatial dose distribution. [1] Further research concerned both Fricke-gel dosimeters and other systems, such as polymer gel dosimeters, radiochromic gel and plastic dosimeters, and flexible dosimeters. Many dosimetric compositions have been proposed. As a general rule, each new 3D dosimeter has a specific acronym, usually derived from its components. Examples of 3D polymer gel dosimeters are as follows (the acronyms are associated with example references): BANG, [16] PAG, [17] PAGAT, [18] nMAG, nPAG, [19] MAGIC, [17,20] MAGIC-f, [21] NIPAM, [22,23] VIPAR, [24] VIP (VIPAR nd ), [25] VIC, [26] VIC-T, [26] VIP3-Pluronic F-127, [27,28] PAGAT2-Pluronic F-127, [29] PAB-IG nx , [14,30,31] NHMAGAT, [32] MAGADIT, [33] NMPAGAT. [34] Examples of 3D radiochromic dosimeters are as follows: PVA-GTA-XO-Fricke, [35,36] PVA-GTA-MTB-Fricke, [37] Fricke-XOgelatine, [38] Fricke-XO-Pluronic F-127, [10,13,39] TTC-Pluronic F-127, [40] NBT-Pluronic F-127, [41,42] KI-PVA, [43] KI-Pluronic F-127, [12] LCV-gelatine; [44] and 3D plastic radiochromic dosimeter: PRESAGE. [3,45,46] 3D flexible dosimeters have also been proposed: LMG-silicone, [47,48] FlexyDos3D, [49] as well as 3D lung-mimicking dosimeters: PAGAT-2-Pluronic F-127 foam, [11] foam based on methacrylic acid-gelatine infused with sodium dodecyl sulphate surfactant, [50] and methacrylic acid-gelatine gel with expanded polystyrene spheres. [51] It should be mentioned that alternative 3D reading techniques to MRI were also investigated, including computed tomography (CT), [22,23,52] ultrasonography, [53][54][55] and optical computed tomography (optical CT). [56,57] It has been shown that 3D dosimetry data This work reports on a new type of combined radiochromic ionizing radiation dosimeter for radiotherapy. The LCV-Pluronic F-127 serves for this purpose, which is a leuco crystal violet embedded in a physical hydrogel matrix of poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) (Pluronic F-127) with additives. This dosimeter responds to ionizing radiation by developing a blue color with an intensity related to the radiation dose. The LCV-Pluronic F-127 dosimeter is improved for lower temperature stability by adding sodium chloride (NaCl). Subsequently, a method for manufacturing the LCV-Pluronic F-127 lung mimicking dosimeter is proposed. Next, the LCV-Pluronic F-127 3D composite dosimeter is elaborated, which cont...

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Novel radiochromic gel dosimeter based on a polyvinyl alcohol – Iodide complex

Cited by 31 publications

References 13 publications

Effects of PVA-GTA-I radiochromic gel dosimeter components on optical dose-response

Effects of PVA-GTA-I radiochromic gel dosimeter components on optical dose-response

Low-Diffusion Fricke Gel Dosimeters with Core-Shell Structure Based on Spatial Confinement

First Combined, Double‐Density LCV‐Pluronic F‐127 Radiochromic Dosimeter Mimicking Lungs and Muscles

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